Lifting roller for drop hammers



Jan, 27. 1925. 1,524,460

I A F. .L. SMITH LIFTING ROLLER FOR DROP HAMMERs Filed July 17, 1922' .Il A /3 l n f3 f5 n -A ,8 79 f5 I l" Y 7, [nf/@M74 l' I* *if /''m/fmLZ/L Patented Jan. 27, 1925.

UNITED STATES PATENT OFFICE.

FRANK L. SMITH, OF AKRON, OHIO, ASSIGNOR TO THE B. F. GVOOIDIIEtICI-'ll` COMPANY, OF NEW YORK, N. Y., A CORPORATION 0F NEW YORK.

LIFTING ROLLER FOR DROP HAMMERS.

Application filed July 17, 1922.

To all whom z' may concern:

Be it known that I, FRANK L. SMITH, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Lifting Roller for Drop I-Iammers, of which the following is a specification.

rlllhis invention relates to gravity hammers, and its object is to provide for a greater frictional lifting power in the rollers which engage the vertically-movable board attached to the hammer-head, thereby securing, among other advantages, a longer life for the board.

0f the accompanying drawings, Fig. l is a side elevation showing the primary working parts of a drop-hammer to illustrate the connection in which my invention is employed.

Fig. 2 is a front elevation, partly broken away and in section, showing the construction of my improved lifting roller.

In Fig. 1, 10 is the anvil, 11 the hammerhea-d, 12 the board attached. to said head, and 13, 13 are the lifting rollers adapted to be operated by any suitable type of mechanism.

In the preferred form of my improved lifting roller 13, shown in detail in Fig. 2, I provide a metallic body or core 14k of cast steel or other suitable metal mounted on a shaft 150, and formed on its periphery with a wide, shallow, groove or channel, located between end flanges 15, for the reception of the frictional facing. The surface of the roller at the bottom of this channel is provided with suitable projections and recesses, preferably in the form of a series of parallel, circumferential ribs 1G, alternating with grooves for interlocking with the hard rubber constituting the foundation of the fricJ tional facing.

17 is a tubular layer of hard rubber vulcanized on the metal core, 18 is a layer of soft rubber surrounding and vulcanized upon the hard-rubber layer, and 19 is a layer of rubberized fabric surrounding and vulcanized upon the soft-rubber layer 18, and forming the outer frictional surface of the roller, for contacting with the board 12. This rubberized fabric element may be of any suitable construction, but I prefer to employ a wide strip of rubber-frictioned,

Serial No. 575,475.

squarewoven fabric wrapped or wound upon itself in successive convolutions until it has been built up to a -depth substantially flush with the periphery of the flanges 15. It will be understood, however, that variations may be made in this and other particulars within the scope of my invention.

Lifting rollers 13, having operating faces of the described construction, provide a durable lifting surface having a high coeiicient of friction, which reduces the necessary radial pressure against the board and greatly prolonge the life of the latter. The soft-rubber layer 13 provides a cushion underlying the rubberized fabric covering, and also furnishes an adequate tie or binder between said covering and the core 14e, through the intervening hard-rubber layer 17, for distributing the torsional strains and maintaining adequate adhesion between the parts. The yielding nature of the covering provides for a slight flattening of the roll surface, which increases its area of contact with the board and thus enhances the lifting power of the rollers and the durability of the lifting mechanism.

I claim:

1. A lifting roller for drop-ham1ners, said roller comprising a core, a frictional facing of fabric, and a rubber cushion underlying said facing.

2. A lifting roller for drop-ln1mmers, said roller comprising a metal core, a tubular layer of hard rubber vulcanized thereon, a soft-rubber cushion layer surrounding and vulcanized on said hard rubber layer, and a facing of rubberized fabric surrounding and vulcanized on said soft-rubber layer.

3. A lifting roller for drop-hammers, said roller comprising a metal core, a hard-rubber layer surrounding and vulcanized on said core, a soft-rubber cushion layer surrounding and vulcanized on said hardaubber layer, and a frictional facing surrounding and vulcanized on said soft-rubber layer and comprising a strip of rubberized, woven fabric wound upon itself in successive convolutions.

In witness whereof I have hereunto set my hand this 12th day of July, 1922.

FRANK L. SMITH. 

